FEDL7041-05

ML7041

22/28

CR3 (Side tone and other tone generator gain setting)

B7

B6

B5

B4

B3

B2

B1

B0

CR3

SIDE TONE

GAIN2

SIDE TONE

GAIN1

SIDE TONE

GAIN0

TONE

ON/OFF

TONE

GAIN3

TONE

GAIN2

TONE

GAIN1

TONE

GAIN0

Initial Value

0

0

0

0

0

0

0

0

B7, B6, B5 ..........Side tone path gain setting (refer to Table 3)

B4 .......................Tone generator ON/OFF 0: OFF 1: ON

B3, B2, B1, B0....Tone generator gain adjustment for receive side (refer to Table 4)

Table 3 Side Tone Gain Settings

B7

B6

B5

Side Tone Path Gain

0

0

0

OFF

0

0

1

–15 dB

0

1

0

–13 dB

0

1

1

–11 dB

1

0

0

–9 dB

1

0

1

–7 dB

1

1

0

–5 dB

1

1

1

–3 dB

Table 4 Receive Side Tone Generator Gain Settings

B3

B2

B1

B0

Tone Generator Gain

B3

B2

B1

B0

Tone Generator Gain

0

0

0

0

OFF

1

0

0

0

–20 dB

0

0

0

1

–34 dB

1

0

0

1

–18 dB

0

0

1

0

–32 dB

1

0

1

0

–16 dB

0

0

1

1

–30 dB

1

0

1

1

–14 dB

0

1

0

0

–28 dB

1

1

0

0

–12 dB

0

1

0

1

–26 dB

1

1

0

1

–10 dB

0

1

1

0

–24 dB

1

1

1

0

–8 dB

0

1

1

1

–22 dB

1

1

1

1

–6 dB

The receive side tone generator gain settings shown in Table 4 are referenced to the following levels as

a reference.

DTMF tones (low group): .............................. +4 dBm0

DTMF tones (high group) and others tones: . +6 dBm0

For example, if the tone generator gain set value is set to –6 dB (B3, B2, B1, B0) = (1, 1, 1, 1), then

tones at the following levels are output at EXTO.

DTMF tone (low group): ................................ –2 dBm0

DTMF tone (high group) and other tones:..... 0 dBm0